04/02/2020 E-Library - Information At Your Fingertips: Printer Friendly of FLGLA No. 542 on December 31, 2018.[45] Again, the decision in G.R. No. 145838 brings out the futility of petitioner's arguments. In no uncertain terms, that decision declared that FLGLA No. 542 was illegally issued. Therefore, from that illegal issuance only flowed an invalid FLGLA, as it is axiomatic in our legal system that acts executed against the laws are void,[46] and that administrative or executive acts, orders and regulations that are contrary to the laws or the Constitution are invalid.[47] Petitioner has no right or interest to speak of, because it is also axiomatic that no vested or acquired right can arise from illegal acts or those that infringe upon the rights of others.[48] Petitioner's proposition that despite the lengthy litigation that culminated in the invalidation of FLGLA No. 542, he still has the "residual right" to enjoy use of the land until December 31, 2018 is absolutely unacceptable. His stance invites anomaly at best, or ridicule at worst, for it asks this Court to render useless its own final decision in G.R. No. 145838. It also solicits disrespect of all judicial decisions and processes. Instead of ending the litigation, it mocks the painstaking process undertaken by the courts and administrative agencies to arrive at the decision in that case. Petitioner's alleged "residual right" has no legal basis and contradicts his admission that FLGLA No. 542 has been declared invalid by the Court in its decision in G.R. No. 145838. Petitioner has had no residue of any right and no entitlement to the land, from the very beginning. Petitioner's concern over his alleged rights under the IPRA have all been addressed in G.R. No. 145838. The IPRA was enacted on October 29, 1997. The decision in G.R. No. 145838 was promulgated on July 20, 2001. On that later date, the Court was already aware of IPRA; and when it rendered the decision, it could have expressly declared that petitioner had residual rights under that law if such was the case.[49] The Court applied P.D. No. 410, the law in effect before the IPRA, in finding that FLGLA No. 542 was illegal. This finally disposes of petitioner's claim that he has rights under the IPRA. In fact, the Court sees petitioner's filing of the present petition as outright forumshopping, as it seeks to revisit what has become a final and executory decision. As explained in earlier cases, the hallmarks of forum- shopping are: Forum-shopping exists where the elements of litis pendentia are present, and where a final judgment in one case will amount to res judicata in the other. Thus, there is forum- shopping when, between an action pending before this Court and another one, there exist: "a) identity of parties, or at least such parties as represent the same interests in both actions, b) identity of rights asserted and relief prayed for, the relief being founded on the same facts, and c) the identity of the two preceding particulars is such that any judgment rendered in the other action, will, regardless of which party is successful amount to res judicata in the action under consideration; said requisites also constitutive of the requisites for auter action pendant or lis pendens." Another case elucidates the consequence of forum-shopping: "[W]here a litigant sues the same party against whom another action or actions for the alleged violation of the same right and the enforcement of the same relief is/are still pending, the defense of litis pendentia in one case is a bar to the others; and, a final judgment in one elibrary.judiciary.gov.ph/thebookshelf/showdocsfriendly/1/46133 8/15