// Remove all range protections in the spreadsheet that the user has permission to edit.
var ss = SpreadsheetApp.getActive();
var protections = ss.getProtections(SpreadsheetApp.ProtectionType.RANGE);
for (var i = 0; i < protections.length; i++) {
var protection = protections[i];
if (protection.canEdit()) {
protection.remove();
}
}
// Removes sheet protection from the active sheet, if the user has permission to edit it.
var sheet = SpreadsheetApp.getActiveSheet();
var protection = sheet.getProtections(SpreadsheetApp.ProtectionType.SHEET)[0];
if (protection && protection.canEdit()) {
protection.remove();
}