I am wondering if it would be legal to turn a store-bought greeting card into a "junk journal"; that is adding papers, ribbons, tabs, pockets, etc., which are sewn into the center of the card to create a booklet. The card itself would be kept intact, just added to.

Also, a similar use...using the cards with the added papers to be the "signatures" of a junk journal book that I have made from scratch. The cards would be sewn into the book as the pages.

Thanks for your help!