Document Watermarking

Watermarks for document security.

Watermarking is quite an old technique, appearing to start in the 13th century when it identified the papermaker or the trade guild manufacturing the paper.  So right from the beginning it was about preventing forgery and identifying the source of the paper.  The Gutenberg Bible was watermarked. Read more

Document Expiry using DRM controls

Using DRM to expire documents.

At the risk of stating the obvious, not all PDF documents are supposed to last forever.

It would be nice if books, fiction or non-fiction, had that ability.  But many historic works have been lost for all time because the library they were in was burned down (this problem still goes on today). Read more

Selling PDF books, files, documents online with DRM copy protection

Using DRM to protect PDFs sold online.

Selling PDF books, files and documents online has obvious advantages.  You can cut costs (no more printed copies to produce and distribute), help save the environment (no more paper), save time (distribution handled automatically by an ecommerce system), and reach new markets.  The downside however is how do you protect electronic copies which by their very nature can be easily re-produced? Read more

Protecting & viewing multiple file types / document formats with DRM

Are native applications an advantage for DRM protected documents?

There are many DRM confidential content control systems available that appear, at least from the literature of their suppliers, to be able to apply DRM content control to many different types of files. Read more

Ebook DRM and license transfer

Selling books in the digital age – are digital rights exhausting?

In the physical (paper) world Copyright has gotten well established as to what the ground rules are when dealing with books.  You sell a book.  Well and good.  In the USA and the EU (under different but similar law) the purchaser can sell the book on to a third party when they have finished with it.

Now the clincher to the deal is that they cannot retain a copy and continue to use it.  The simple control is that the purchaser will not pay unless they get the one and only paper copy (first edition, hardbound, paperback, signed copy, with cover, and so on) at the bargain price. Read more