Section 1. Section nine of Presidential Decree Numbered Nine hundred sixty-eight, as amended by Presidential Decree Numbered Twelve hundred and fifty-seven, is hereby further amended to read as follows:
"Sec. 9. Disqualified Offenders. The benefits of this Decree shall not be extended to those:
"(a) sentenced to serve a maximum term of imprisonment of more than six years and one day;
"(b) convicted of any offense against the security of the State;
"(c) who have previously been convicted by final judgment of an offense punished by imprisonment of not less than one month and one day and/or a fine of not less than Two Hundred Pesos; and
"(d) who have been once on probation under the provisions of this Decree."