While we are working hard on improving our current services, Merge PDF and Split PDF, we are also planning to launch a couple of new services. We thank all our users who have given us valuable input in improving our services. We have submitted a lot of updates in the past few months. Please keep sending us bug reports when you encounter a failure, either through the comments or through email.
The new services will complement our other services, allowing users to remove passwords from PDF documents (UnlockPDF), as well as adding protection to their documents (ProtectPDF).
The PDF standard supports two kinds of passwords for each file. An owner password can be specified which allows adding protection such as limiting viewers' rights to print and/or edit the document and so forth. A user password is more restrictive as it requires a password to open the document.
UnlockPDF will be able to remove passwords from documents with owner passwords, even without specifying the password. However, for documents with user password, a password will be required to unlock pdf. It will also be possible to enter multiple passwords and our program will go through the list, trying each password until it finds the correct one. This will help if you do not remember exactly what password you used when the protection was added.
ProtectPDF, on the contrary, will allow users to add user and/or owner password to documents. The level of restrictions can also be specified, such as whether printing is allowed, and/or document edits, and so on.
If you have any suggestions for these planned services, please let us know and we will try to incorporate them, if possible!
Update: The services are now available and the links have been added in the above text.