PDF Security software

As I was browsing this site, it made me analyze that this PDF DRM document security software would be ideal for my husband. He got tons of pdf files that he uses with his teaching seminars, and I thought of perhaps getting one of this to protect his files. The good thing is it doesn't need a password...hubby hates that because he forgets his passwords at times! lol.
This security software is from Locklizard, and I think with its powerful features in pdf file protection, it is for guaranteed safety. I must recommend this site to my husband.