The Adobe portable document format was developed in 1993 to allow document sharing. A file saved as a PDF document does not require people viewing the document to have the software that created the document installed on their computer. Adobe PDF files can be viewed and printed with a free program, such as the popular Adobe Reader, and edited with an application such as Adobe Acrobat. You can prevent others from editing a PDF by adding password security to the file using a program such as Acrobat, a downloadable converter such as PrimoPDF or a password protection website such as PDFProtect. Tips Writer Bio
