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PDF Document Management 14: Add a Digital Signature into PDF Document

A digital signature (ID). like a conventional handwritten signature, identifies the person signing a document. Unlike a handwritten signature, a digital signature is difficult to forge because it contains encrypted information that is unique to the signer and easily verified. It is usually password protected and can be stored on your computer in PKCS #12 file format (Personal Information Exchange File, PFX).

When you buy a new digital signature, you get .spc file that contains the certificate and .pvk file that contains your private keys. U se Microsoft command-line tool Pvk2Pfx to convert them into a PFX file. See detail here.

The following command generates the .pfx file Mypfxfile.pfx from Mypvkfile.pvk and Myspcfile.spc. The command supplies the password mypassword for the .pvk file, which becomes the password for the .pfx file Mypfxfile.pfx:

pvk2pfx -pvk mypvkfile.pvk -pi mypassword -spc myspcfile.spc -pfx mypfxfile.pfx

This function can create document-level Digital Signature that apply to the entire document.

Here are the steps on how to Add Digital Signature into PDF Document.

2. Select a PFX file with digital signature.

3. The Create Digital Signature to Document dialog box comes up:

  • Select a File. Select a PFX file with digital signature.
  • Enter Password. The password for the digital ID.
  • Allow Multiple Signatures. If checked, the signature and all the other content will be added as a new revision thus not invalidating existing signatures.
  • Keystore Type. The specified keystore type. pkcs12 is the most common type.
  • Keystore Provider. Sets the Cryptographic Service Provider that will sign the document. Leave it empty for pkcs12 type.
  • Signed Type. The mode can be Self signed (Adobe.PPKLite). VeriSign plug-in (VeriSign.PPKVS) and Windows Certificate Security (Adobe.PPKMS).
  • Reason. Sets the signing reason.
  • Location. Sets the signing location.
  • Contact. Sets the signing contact.
  • Appearance.
    • Visible. Sets the signature to be visible on the Position of the selected Page.
    • Page Number. Select the page number for the digital signature.
    • Appearance: There are 4 Options: Description Only, Signer Name and Description, Signature Image and Description, and Signature Image only.
    • Let/Right/Top/Bottom. The position for the digital signature.
    • Use Signature Image. Set the signature image if the Appearance option is Signature Image and Description
    • Use Background Image. Set the background image. Leave it blank if no background image.
    • Background Image Scale. Set the scaling to be applied to the background image.

4. Click Close to finish.

Question 1: The Validity of digital signature is displayed as UNKNOWN inside Adobe Reader, how to make Signature Valid ?

1. Click inside the signature with Validity Unknown ;
2. The dialog of Signature Validity Status will show up. Click Signature Properties ;
3. From Dialog Signature Properties . click Show Signer’s Certificate ;
4. From Dialog Certificate Viewer , click Trust Tab and then click Add to Trusted Certificates ;
5. Import Contact Settings will come up, click OK.
6. Close Adobe Reader and open your PDF again. You will see the Signature Valid .

Question 2: How to remove the imported digital signature from my computer?

1. Open Adobe Reader= Edit Menu= Preferences= Signatures= Identities Trusted Certificates= More;
2. Dialog Digital ID and Trusted Certificate Settings comes up, click Trusted Certificates . Select the Certificate to remove.
3. From Internet Explorer = Tools Menu = Internet Options= Contents= Certificates= Select the Certificate to remove.

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What are the Different Types of Commercial Air Conditioning? #types #of #commercial #air #conditioning,air #conditioning,multi-split #systems,split #systems,vrv


What are the Different Types of Commercial Air Conditioning System?

6th November 2014

Air conditioning is used in most commercial properties, ranging from small shops and cafés to large office buildings and public spaces.

To meet these diverse applications, air conditioning systems have different heating and cooling capacities and come with various setups and layouts.

There are almost infinite configurations within each category, but the main types of commercial air conditioning are:

  • Single Split System
  • Multi-Split System
  • VRF or VRV System

They all use the same basic technology and identical wall- or ceiling-mounted indoor units. However, they have very different applications, so it s important to find out which is best for you.

Split System Air Conditioning

Single splits are the most affordable type of air conditioning system and suitable for use in small commercial buildings. They provide heating and cooling to individual rooms, making them ideal solutions for small offices, shops, cafés and server rooms .

They can also be used in combination to serve larger spaces and multiple rooms. The only downside is that you need enough external space to have one outdoor unit for every indoor unit.

However, there are advantages to doing it this way. Firstly, it’s often cheaper than installing a central system, and, as each system is self-contained, if one unit breaks down. the others remain fully functional.

Even though they re the cheapest type of air conditioning, single splits are effective and energy-efficient systems. Their versatility makes them great for all kinds of applications and they’re extremely popular with small businesses .

Multi-Split System Air Conditioning

Multi-splits work in exactly the same way as single splits but, depending on the model, you can connect up to nine indoor units to one outdoor unit. They’re most frequently used in places like restaurants, offices, doctor’s surgeries and shops.

It’s always preferable to have fewer outdoor units, particularly if you lack space or want to preserve your building’s external appearance. That gives multi-splits a distinctive advantage over several single splits.

Another selling point is that you aren’t limited to using just one type of indoor unit. If you wanted to, you could have any combination of wall- and ceiling-mounted air conditioning units, along with an air curtain over the entrance.

However, multi-split systems are slightly more complex and require more pipework than several single splits. That can make the installation more expensive and take longer, particularly if you’re only looking to install a few indoor units.

Ultimately, the best solution depends on the layout of your building and the heating and cooling capacity you require.

VRF or VRV Air Conditioning

VRF stands for variable refrigerant flow, while VRV stands for variable refrigerant volume. It might seem confusing but they mean exactly the same thing.

Daikin originally developed the technology, calling it VRV, but then protected the term to stop other manufacturers from using it. That’s why everyone else calls it VRF.

VRF/VRV air conditioning is the best solution for medium to large applications, including hotels, retail spaces. larger offices and mixed-use buildings.

The systems are extremely efficient, reliable and easy to control, capable of meeting larger buildings’ complete heating and cooling requirements. They also come with reduced installation times, minimising disruption.

There are two types of VRF/VRV system, heat pump and heat recovery. Heat pump VRF/VRV systems can provide either heating or cooling to a building at any given time, making them ideal for open plan areas.

Heat recovery VRF/VRV systems are capable of providing simultaneous heating and cooling to different areas at the same time, making them perfect for buildings with lots of individual rooms. The most efficient commercial air conditioning systems, they recover waste heat from around the building, using it to heat other rooms and hot water. Heat recovery systems are also more flexible, as you have the option to heat one room while cooling another.

If you d like B-DACS to install one of these commercial air conditioning systems, give us a call on 0141 773 3355 to arrange a free site survey.

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