I saw your site on wallpaper installation and I have a few questions. Thank you for your help. The Peelable paper has a vinyl layer on top of a paper backing. It is designed to let the top layer pull off and leave the paper backing.
Strippable paper is meant to come off completely without dividing.
Either way, you have to get the glue wet to soften it to be able to remove the paper. Peelable paper leaves the paper backing that ready absorbs water, strippable paper must be scored to allow penetration past its water resistant surface. A tool called a Paper Tiger has spurs on it to prick the paper and provide these points of entry. You are lucky to live in the last part of the 20th century because there are lots of different methods to choose from for wetting the glue. Newer methods include a semipaste gel from DIF that clings to vertical surfaces and also newly marketed is a sheet of absorbant material that clings to the wall and soaks the paper.