Are all versions of Adobe PDF Library and the .NET and Java Intefaces thread safe?

The Adobe PDF Library and the .NET and Java Interfaces are thread safe.

Any number of threads can read a PDF file at one time, but each variable is specific to the thread where that variable was created. What this means, for example, is that if your application opens PDDoc in thread A, that application can’t also open PDDoc in a different thread. We recommend you do not share PDF Library data and resources among threads, including PDF documents, unless you are only performing read operations.