Copyright©:

Copyright gives the author a protection of his original work exclusive right for a period of time.Only the copyright holder has the legal power:

-to produce copies or reproductions of the work and to sell those copies
-to import or export the work
-to create works that adapt the original work
-to performance rights
-to sell or assign these rights to others
-to broadcast rights

*When we need the material or information from the owner we should ask permission.Permission to use someone else's material does not make you the rightful owner or holder, it just gives you the right to use it under the real owner's conditions, so it's always best to include text on the same page where the material on loan is being used to specify who the real owner is, and that it is being used with permission.

Computer security:

Computer security is applied to computer or networks to protect the information or property from theft or corruption.Special user names and passwords are typically used to prevent unauthorized access to software and data,
to prevent loss or accidental destruction of data.